Vienna Girardi is seen at a day of Beauty & Rejuvenation hosted by Vienna Girardi, Biolustre & Reality Cares at Batia & Aleeza Salon on July 21, 2010 in Los Angeles, California.

Robert Pattinson and Kristen Stewart pose for a private photo shoot at Marche on May 5, 2010 in Chicago, Illinois

Robert Pattinson and Kristen Stewart pose for a private photo shoot at Marche on May 5, 2010 in Chicago, Illinois-1

Kristen Stewart, left, and Robert Pattinson kiss as they accept the award for best kiss at the MTV Movie Awards in Universal City, Calif., on Sunday, June 6, 2010

Kristen Stewart and Robert Pattinson

New Moon’ UK fan event at Battersea Evolution on November 10, 2009 in London, England

Kristen Stewart and Robert Pattinson attend the “Eclipse” premiere at Regal 14 at LA Live Downtown on June 24, 2010 in Los Angeles, California.

EXCLUSIVE! Robert Pattinson Is Freaking Out About GF Kristen Stewart's Sex Scenes With 'On The Road' Co-Star Viggo Mortensen!

Robert Pattinson is so worried about hanky panky going on during his girlfriend’s racy scenes with Viggo that now he’s planning on hanging out on-set…ALOT

Guess what, BFFs? Robert Pattinson is JEALOUS over one of GF Kristen Stewart‘s good-looking new male co-stars — and it isn’t the young and hot Garrett Hedlund or Sam Riley, either! Nope, his real beef is with Viggo Mortensen – who, at 51, is more than twice K-Stew’s age!

“Rob plans on being on the set of On the Road, not because he has a role in the drama, but because Kristen has a real risque part!” an insider tells HollywoodLife.com exclusively. “There are a lot of sex scenes including a threesome, and Rob wants to make sure that it’s all pretend from the start and finish of the film.”

Furthermore, the 24-year-old British hunk wasn’t happy that Kristen, 20, decided to take the role of sexually promiscuous young Marylou Moriarty, the wife of Garrett’s troubled drifter, Dean, in the big screen adaptation of Jack Kerouac‘s Beat Generation novel in the first place! “He didn’t like that Kristen was even considering taking this role. He understands that she doesn’t want to be known as just Bella from Twilight, and he’s doing the same thing with his own career, but he didn’t take on a role as risque as hers!”

The fact that sexy Viggo is in the film as Old Bull Run, a married druggie pal of Dean’s, is causing a rift between theTwilight lovers. “He’s very jealous,” our insider says. “Kristen told him she didn’t want him on the set because it would make her feel uncomfortable, but Rob said he’s going to be there. Especially now that her scenes are with Viggo, who is very very hot! Rob is free until filming begins on the next Twilight film, so he’s got all the time in the world to keep an eye on Kristen – and he will.”

Although Kristin and Viggo don’t have any sort of love scene in the film, Rob may be jealous because Viggo is an artistic, romantic, brooding guy like himself – just way, way older. Still, we think Rob may need to take a reality check on the jealous behavior! Viggo may be hot – but he’s old enough to play Kristen’s DAD. You’re way hotter — stop worrying!

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Hollywood Lie I hope you’re proud of your sleazy selves. Your fake story has been picked up by all the gossip sites. Those of us with a conscience and our sanity know what the true story is. Also as women you’ve proven yourselves to be very catty.

This Is sooo funny Dont you know that Robert trust Kristen he knows shes an actor and well be doing a lot of sex scenes in her life. they are only acting when shes doing other movies. BUT AT HOME IN THEIR BED THEY WONT BE ACTING and he knows that.That is part of a STRONG and LOVING RELATIONSHIP they have as a COUPLE

AS YOU CAN SEE HOLLYWOOD LIFE NO ONE BELIEVES YOU. WHY DON’T YOU STOP MAKING UP STORIES?! YOU ARE TROUBLE MAKERS AND PEOPLE ARE GOING TO ALWAYS CALL YOU ON IT. YOU’RE TRIFLING. I CAN’T IMAGINE THAT LEVEL OF JEALOUSY BETWEEN ROB AND KRISTEN AT ALL. THEY’RE BOTH PROFESSIONALS WHO TAKE THEIR JOBS SERIOUSLY.

Hollywoodlife – As usual you have made up a load of tripe to sell your rag.

What a laugh… Robert getting all uptight about Kristen’s risque role?!… Robert himself did a movie called BelAmi a little while ago (yet to be released) and in his own words, the character he played was amoral! His character Bedded all manner of women in his rise to the top caring for nothing other than the need to gain the political pinnacle of the day. So why would Robert get all prissy about Kristen’s role?

Crumbs you really do need to research before you make up this kind of drivel… It’s just laughable!

One other thing!… Robert & Kristen are two sane and normal people with good heads on their shoulders… they are not the shallow, bed-hopping, insecure teenagers you try to make them out to be. Please stop judging others books by your own reporters covers or trying to invent dramas – it just makes your rag appear to be moronic.

WHY ON EARTH WOULD HE THINK SHE WOULD GO FOR A 51 YEAR OLD WHO SHE HAS NO INTIMATE SCENSE WITH. IF YOU HAD SAID GARRETT YOU WOULD HAVE HAD MORE CHANCE OF US BELIEVING YOU. YOU FAIL YET AGAIN, AND HIS NAME IS OLD BULL LEE. YOU ARE SO FULL OF FAIL I DON’T KNOW WHERE TO BEGIN, I WOULD ACTUALLY BELIEVE KRISTEN WAS PREGNANT BEFORE ANY OF THIS SHIZ.

Wow! What a beautiful couple! Love you Kristen and Rob wish you love, happiness and lots of luck in everything you do. Be happy and let the negative comments give you more strength to reach your dreams, it works for me! MUUUUUUUUUUUUUUUAAAAAAAAAAAA

wow, you guys need to get your game on better. Viggo and Kristen have no intimate scenes. Kristen got this gig BEFORE Twilight even hit theaters, so to say it was a chance for her to break out from Bella is wrong. And Robert is jealous and not happy about this? I call BS – it’s one of his favorite books, he’s a kerouac fan. It’s a big deal, and he’s done more risque films himself. I think you guys need to at least make your fanfiction plausible, it’s like you guys do zero research, a quick google search would have made half your mistakes clear. And “alot” is incorrect, it’s “a lot.” Two words!